<template>
    <div class="login-container">
        <div class="login-box">
            <!-- 头像区域 -->
            <div class="avatar-box">
                <img src="../assets/logo.jpg" alt />
            </div>
            <!-- 表单区域 -->
            <el-form
                ref="loginFormRef"
                :model="loginForm"
                :rules="loginFormRules"
                label-width="0px"
                class="login-form"
            >
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="el-icon-user-solid"></el-input>
                </el-form-item>
                <el-form-item prop="password">
                    <el-input
                        v-model="loginForm.password"
                        prefix-icon="el-icon-key"
                        type="password"
                    ></el-input>
                </el-form-item>
                <el-form-item class="btns">
                    <el-button @click="login" type="primary">登录</el-button>
                    <el-button @click="resetLoginForm" type="info">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default {
    data() {
        return {
            loginForm: {
                username: "",
                password: ""
            },
            //表单验证规则
            loginFormRules: {
                username: [
                    {
                        required: true,
                        message: "请输入账户名称",
                        trigger: "blur"
                    },
                    {
                        min: 3,
                        max: 10,
                        message: "长度在 3 到 10 个字符",
                        trigger: "blur"
                    }
                ],
                password: [
                    {
                        required: true,
                        message: "请输入登录密码",
                        trigger: "blur"
                    },
                    {
                        min: 6,
                        max: 15,
                        message: "长度在 6 到 15 个字符",
                        trigger: "blur"
                    }
                ]
            }
        };
    },
    methods: {
        //点击重置按钮，重置登录表单
        resetLoginForm() {
            this.$refs.loginFormRef.resetFields();
        },
        //登录
        login() {
            this.$refs.loginFormRef.validate(async valid => {
                if (!valid) {
                    return;
                }
                const { data: res } = await this.$http.post(
                    "login",
                    this.loginForm
                );
                //账号：admin 密码：123456
                if (res.meta.status !== 200) {
                    return this.$message.error("登录失败");
                }
                console.log(res)
                this.$message.success("登录成功");
                //1.将登录成功之后的 token，保存到客户端的 sessionStorage中
                //  1.1 项目中除了登录之外的其他API接口，必须在登录之后才能访问
                //  1.2 token 只应在当前网站打开期间生效，所以将token保存在 
                //      sessionStorage（localStorage是持久化的存储机制，sessionStorage为会话式的）中
                window.sessionStorage.setItem('token', res.data.token);
                //2.通过编程式导航跳转到后天主页，路由地址是 /home 
                this.$router.push('/home');
            });
        }
    }
};
</script>

<style scoped lang="less">
.login-container {
    background: #2b4b6b;
    height: 100%;
}
.login-box {
    width: 450px;
    height: 300px;
    background: #fff;
    border-radius: 3px;
    position: relative;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar-box {
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%);
        background-color: #fff;
        img {
            width: 100%;
            height: 100%;
            border-radius: 50%;
        }
    }
}

.login-form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}

.btns {
    display: flex;
    justify-content: flex-end;
}
</style>